Nobody talks like this anymore, but the etymology of “psychology”—from the Greek psyche and logia—is plausibly rendered as “science of the soul”. Perhaps it is apt that talk of souls is out of vogue, as our modern conception of psychology is much narrower than those of our ancestors: Aristotle’s starting point was that the soul is “the principle of animal life” [1], whereas modern psychologists are mainly interested in the mental aspects of that life […]